铁路站场的过度建设在土地稀缺的密集城市地区创造了急需的额外房地产。在一个这样的案例中，有人提出了一个超建筑开发项目，包括多用途建筑和一个大型公园，公园内有树木和植物，位于封闭的铁路车场上方。对于直接种植在地面上的植被来说，地球通常是环境热源的热接收器；然而，位于铁路堆场上方种植园浅层土壤深处的树木和植物可能会因铁路堆场内的环境和热源而过热。在该拟议开发项目中，种植园的建设旨在缓解铁路站通风系统运行时从铁路站散发的热量，以满足其正常通风目标。 尽管如此，如果超过土壤科学家和树木学家确定的土壤目标温度的某个中心，将需要一个冷却系统。本文总结了对由混凝土、隔热层、土壤和覆盖层组成的播种机结构进行瞬态一维有限差分热分析的结果。热分析使用典型计量年的参数来确定外部和封闭铁路场随时间变化的环境条件，并考虑因电容和热物理性质而产生的累积热滞后，以确定土壤温度中心。土壤的体积含水量以及隔热层和土层的厚度会发生变化，以确定其对建筑物热性能的影响- 保持土壤温度的目标中心。每项研究的最坏情况构成了确定冷却系统尺寸的基础。然后，本文描述了一个优化的冷却系统，包括穿过混凝土冷却板的辐射冷却PEX管道回路、理想的回路布置和配置，以及针对这一特殊开发的冷却控制策略。基于该热分析的分析驱动设计降低了装机容量，并将冷却系统的运行时间降至最低。引文:2018年冬季会议，伊利诺伊州芝加哥，会议论文

Rail yard overbuild creates much needed additional real estate in dense urban areas where land availability is scarce. In one such case, an overbuild development incorporating mixed-use buildings and a large park with trees and plants above an enclosed rail yard, has been proposed. Earth typically serves as a heat sink from ambient heat sources for vegetation planted directly in the ground; however, trees and plants located in the shallow soil depths of planter build-up above a rail yard can be overheated by ambient and heat sources within the rail yard. In this proposed development, the planter build-up is designed to mitigate the heat dissipated from the rail yard while the rail yard ventilation system is operating to meet its normal ventilation objectives. Nonetheless, a cooling system will be required if a certain center of soil target temperature, as determined by a soil scientist and arborist, is exceeded. This paper summarizes the results of a transient one-dimensional, finite difference based thermal analysis of a planter build-up composed of concrete, insulation, soil, and mulch layers. The thermal analysis uses parameters from a typical metrological year to determine time-varying ambient conditions of the exterior and the enclosed rail yard and accounts for build-up thermal lag due to capacitance and thermophysical properties to determine the center of soil temperature. The volumetric moisture content of the soil and the thickness of the insulation and soil layers are varied to determine their impact on the thermal performance of the build-up in maintaining the target center of soil temperature. The worst-case scenario of each study forms the basis for sizing of the cooling system. The paper then describes an optimized cooling system consisting of radiant cooling PEX piping loops running through a concrete cooling slab, ideal loop placement and configuration, and cooling control strategy for this particular development. Analytically-driven design based on this thermal analysis resulted in reducing the installed capacity and minimizing the cooling system operating hours.